englund



Feb. 19, 1929.

E. A. ENGLUND I MILKING MACHINE Filed Nov. 15, 1926 3 Sheets-Sheet 1 Feb. 19, 1929.

E. A. ENGLUND MILKING MACHINE Filed NOV. 15, 1925 QM, Wm, M SW \W V 52% n 'INVENTOR 5014/4 20 AZBERI'E'IVGAUND ATTORNEY E. A. ENGLUND MILKING MACHINE 5 Sheets-Sheet 3 Filed Nov. 15, 1926 INVENTOR 5014/4/20 AABe'QrE/vsu/Aw BY g3 ATTORNEY Patented Feb. 19, 1929.

UNITED STATES EDWARD A. ENGLUND,

MILKING Application filed November 15, 1926'.

My invention relates to machines adapted to be applied to milch animals, such as cows, for drawing milk from the teats of the animals by mechanical means.

A primary obj ect of the invention is to construct a milking machine so that it may be attached to a milch animal for holding a teat therein. and to provide means for squeezing a quantity of milk from the teat without causing injury to the teat, or any other injury whereby the animals health may be affected 01' the flow of milk reduced, as is frequently the case when suction is employed for draw ing the milk.

Another important object of the invention is to provide a milking machine with means for squeezing the milk from the teats in such a manner that back-flow. which may cause the animal to be temporarily non'yielding of milk. is prevented.

Further objects and advantages may appear from the following detailed description having reference to the accompanying drawinns, in which a preferred embodin'ient of the invention is illustrated. and in which:

Figure 1 is a vertical, mid-sectional side elevation of the machine. with the piston in its initial intake position in the cylinder and the inlet valve open and the outlet valve closed and the teat squeezer held in a nonsqueezing' position:

Fie'ure 2 is a. mid-sectional side elevation.

similar to Figure l. but with the piston in its terminal. SQllGPZQI'fiCl HHiI UQ position. the inlet valve clos d and the outlet valve open. the teat receptacle holding a teat therein. and the teat squeezer in its extreme squeezing position ao'ainst the teat receptacle:

Figure 3 is a plan of the machine with the parts in the positions shown in. Figure 1, the cylinder and the head being broken awav in order to show some interior parts more clearly Figure is a view. taken along the line l -l in Figure 2. and showing the cylinder in end elevation. the rocker arm attached to the cylinder. and also sectionally the piston rod that slides in the rocker arm;

Figure 5 is a sectional view, taken along the line 5-5 in Figure 2 and showing the valves and their connecting" means as well as the valve guides, and also parts of the valconniving means as well as the spring;

PATENT OFFICE.

OF HILLSBORO, OREGON.

MACHINE.

Serial No. 148,474.

means for returning the piston to its initial intake position in the cylinder; and

Figure 6 is a view, taken along the line 6-6 in Figure 2 and showing the piston rod in section and the lever arm connected therewith as well as the spring means for urging the teat soueezer to its inclined position.

In the drawings the milking machine as a whole is indicated by the numeral 1. It comprises a frame 2, which may be provided with suitable means, such as straps 3 adapted to pass over, and to be buckled in place on. a milking animal for securing the frame to the animal.

The frame is at one end provided with a clamp 4, which is adapted to be clamped over a cylinder 5 so as to secure the cylinder adjustably to the frame. At its end awav from the frame the cylinder may be threaded for securing thereon a head 6. in which is an inlet-valve opening 7 and an outlet-valve openinc" 8. the inlet-valve opening 7 being; adapted to seat therein an inlet valve 9. and the outletvalve opening 8 being adapted to seat therein an outlet valve 10, and the arrangement of the valves being such that the inlet valve 9 opens away from the cylinder. and the outlet valve 10 opens toward and into the cylinder The inlet valve 9 is secured upon or integral with a stem 11. which is adapted to re ciprocate in a bearing .12 secured to the inside of a cylindrical tube-member 13 and arran ed in a coaxial relation to the valve opening 7. This cylindrical member 13 is prefera y forme int ral h t e he 6 and is a apt d to be connect d with an su able flu d power-source. su h as compres d air or anv other fluid under pressure. for leading the fluid throutrh the inlet openinc' 7 into the cylinder 5. The outlet valve 10 is secured upon or integral with a stem 14 and the stem is adapted to reciprocate in a bearing, 15, which may be secured to the outside of the tubular member 13 or otherwise arranged integral with the head 6 in a coaxial relation to the valve opening 8.

For the purpose of moving the valves 9 and 10 in unison, the stems 11 and 14 are at their inner ends fixed in. a connecting memher 16, which serves further to maintain the (o-axial relation of the valves to their re spect-ive seats. In Figures 1, Q and S the length of valve movement is t-tfaggci'uted in ltlii order to illustrate more clearly the valve action, but it should he understood that the valve movement is relatively small and only suiiicicnt for delivering the proper quantity of fluid under pressure to the cylinder or for providing a comparatively un obstructed pasof the fluid therefrom.

The connectin member 16 is laterally pro vided with notches 17, and guide hars l8,e:*:- tending inte rally with the head 6 on the inside thereot, lit slidahly in the respective notches so as to maintain the valves in coaxial relation to their respective seats dur ing' the valves reciprocating inoven'ients to and from the seats. At its outer end the stem let is fixed to one end of another connecting member 19. the other end o't which fififid on the outer end of a rod 20, and the rod is slinahly mounted in bearing); hloclis 21 and 22 so as to be i'iarallel with the valve stems 11 and l t and thus by its movementcause the valves to move freely LU or trom their rcspec tive seats.

In the cylinder and adap ed to reciprocate therein is a piston p ciaahlyhaving a packing 24 oi. a sn' thereto at its end toward the cylinder head 6. A specially shaped piston rod 25 is pivotclly connected at its inner end, as shown at 26, with a member 26 on the piton, and

is at its outer end pivotally connected, as shown at 27, with a member 27 on a teat squeeze}? 28. This teat squeezer preterahl -z consists of a still hoard, which extends on both sides within the frame 9 and at its top provided with a bar 29. In each side at the top of the frame are guides 30. which register with each other and. in which the ends of the bar ex end so as to allow the bar both a sliding anda pivotal movement there in. The guides are preferably straight and virtually parallel with the axis of the cylinder and terminate at the end away from the cylinder in upward extending portions 31, which are adapted to receive the respective ends of the bar therein and, when so received, to raise the teat squcezer thercwith at'the end of its sliding movement away from the cylinder. At its bottom the teat equeezer is provided with another bar 2, he ends of which extend in respective registerin guides 33 in the frame so as to allow the oar to slide therein. Each of the guides an initial straight portion parallel t e guides 30, and a terminal curved l rticn which is inclined slightly downa'rl From the straight portion, and the guides it) I r I A i r'" a 9 we) ale positioned in advance or the guides o0 toward the cylindcrh, so that the teat squeezer 28 is thereby adapted to he held initially with its top inclined away from the cylinder and to retain the same inclined position until the bar 29 reaches the terminal upward portions 31 in the guides 30 and the bar 32 at the some time reaches the curved portions 35 oi the guides 33. The teat squeezer Will then move pivotally around the bar Q9 in the portions 31 and at the same time the Mar 33 will follow the curved portions 35, so that from its in. clined position the teat sqneezer will gradually approach a right-angular position relativeto the axis otthe ylindcr A receptacle 36 of apliahle material, such as rubber, for instance, and adapted to receive therein .a vteat 37, as shown in Figure 2, is suitably fastened at its top to the frame 2 and also under the bar 29 to the teat squeezer sons to he in the path defined by the squeezers sliding and pivotal movement. The receptacle is open both at its top an d bottom. and the latter is preferably contracted and has secured thereto an internally threaded ferrule by which :the receptacle is adapted to be connected with conveying means for leading: milk from the receptacle to any suitable container. In order to squeeze the teat more elliciently the teat receptacle may have at its top, where it is attached to the teat squeezer, a thickened portion 39, also of rubber or other comparatively soft material. that is not liable to injure teatheld in the re cept-acle.

The pivotal ati'zachment at 2'? of the pie-- ton rod 25 to the member 27 on the teat squeezer is, as is clearly sl'iow'o in Figures 1 and 2, above the center of t 1e teat squeeacr. Consequently, the tendency ot' the piston in its reciprocating movement toward the teat squeezer is to assist the guides 30 ant 83 in holding the teat squeezcr with its tog inclined toward the receptacle. ill. sprin- 40,hoolred with one end to a pin e1 in the end oi a lever arm 42, which is secured below the pivot 27 to the piston rod, and, wi 1 its other end hooked over the bar at the hottom oi the teat squeeZer,-:turther serves to draw the teat squeezer toward the lever arm and thus to urge the teat squecraer to its in J mally inclined position. The lever arm pre'l? erahly comprises two matched members (a and E), which are on opposite sides of the piston rod and approximately midway re formed with an opening 0. At its end ti o lever arm islient away from the eat squcezer and is towardthe teat squeezer provided with a flat portion (Z, which is adapted to abut the bottom of the member 27 so that, when the teat squeezer is urged by the spring to toward the lever arm, the flat portion 0 pie vents the teat squeezer from swia ing heyond the inclined position that as. .res it a tree sliding movement by the eng" genient oi the bars 29 and 32 with the in' portions of the guides 30 and 33. Another spring 43, also attached with one end to the pin 41 and with its other end to a pin it at the end of a downward extension 45 integral with the hearing block 21, serves the purpose of normally holding the piston in its initial intake positionin the cylinder.

Lil

Upon the piston rod are formed cams 46 and 47, the cam 46 being on the top of the piston rod and sloping upward toward the end where the piston rod is pivotally attached to the piston 23. This cam may be provided with a terminal portion 4:8 which is less sloping than the initial part of the cam. The cam a7 is on the underside of the rod and slopes downward toward the lever arm 42 at the other end 01"? the rod.

In the top of the cylinder and at the end thereof toward the teat squeezer is mounted a rocker arm 49. which preferably consists of two similar metal strips 50 having spacing blocks 51 interposed between them, the strips and the blocks being secured to one another by any suitable means, such as rivets 52, in order to form a unitary member. The blocks 51 are so spaced from each other and are so shaped and also hold the strips 50 spaced from each other in such a manner as to allow the piston rod to move freely within the rocker arm. An elongated opening 53 in both strips serves to receive therethrough a screw 51 for pivotally and slidably fastening the rocker arm to a bracket 55, which is secured at the top of the cylinder and extends through a notch 56 so as to allow a free movement of the rocker arm within the notch, while a longer notch 57 in the bottom of the cylinder allows free rocking and sliding movement of the rocker arm in and through the bottom.

The blocks 51 are so spaced from each other, and the shape of the piston rod and the rods attachment to the piston are such that, when the piston is in its terminal position toward the teat squeezer, as shown in Figure 2, the upper block 51 will engage the terminal cam-portion 48 on the cam 46 and there will be only a slight play of the piston rod between the upper and the lower block. At the same time a hook portion 58 on the piston rod will engage the side of the lower block 51 and thus prevent the rocker arm from moving beyond its engaging posiion on the cam a6. Again, when the piston is at its initial intake position in the cylinder, as shown in Figure 1, the lower block 51 will engage the cam 47 on the piston rod, and at the same time the side of the block will engage another hook portion 59, formed on the rod for a purpose that will presently be explained.

On the rod 20 and between the bearing blocks 21 and 22 is suitably secured a collar 60, and on the rod and between the collar and the bearing block 21 is placed a spring 61, which normally urges the collar away from the bearing block and therewith also moves the rod 20 so as to close the inlet valve 9 and open the outlet valve 10. The rocker-arm strips 50 extend below the cylinder and hold the rod 20 between them so as to allow a relative freedom of movement between the rocker arm and the rod. Upon the rod and on each side of the rocker arm is placed a collar 62, provided with an enlarged opening therein in order to allow the collars to assume varying angular positions on the rod, which has further at a suitable place between the bearing block 22 and the rocker arm lined thereupon a collar 63. An additional collar 64, which is of such a diameter that it is adapted to move freely in the opening 0 of the rocker arm, is fixed on the rod at its end toward the teat squeezer, and a spring is placed on the rod and between the fixed collar 63 and the movable collar 62 nearest thereto at the side oi the rocker arm, while another spring 66 is placed between the end collar Sat and the other collar 62 on the other side of the rocker arm.

At the end and to the outside of one of the strips 50 is secured a block 67. A spring 68 is fixed to the cylinder and is so shaped that it is out of the path of the lower block 51 in the rocker arm and is unopposed to the block (57 when the rocker arm is uninfluenccd by the lifting action resulting from the engagement of its upper block 51 with the cam l6 on the piston rod. he free end of this spring is adapted to engage an upper, reduced portion 69 on the block 67 as soon as the rocker arm is su'lliciently influenced by the lilting action to place the block 67 in the path of the spring. Another spring 70, similar to the spring 68 but oppositely disposed thereto, is also lixed to the cylinder and is so shaped and placed that it is out. of the path of the block 67 and is unopposed to the lower block 51 when the rocker arm is uninfluenced by the lowering action resulting from the engagement of its lower block 51 with the cam 17 on the piston rod. As soon as the rocker arm is sulticiently inlhr enced by the lowering action to place the lower block 51 in the path of the spring 7 (I, the free end of the spring is adapted to engage a lower, reduced portion 71 on the block. Either of the springs 68 and will thus allow the rocker arm to slide over it when the rocker arm is moved in. the direction of the free end of the spring, but it will oppose such a sliding movement when the respective spring comes into engagement with the reduced portion of the respective block 67 or 51.

\Vhen the milking machine 1, constructed r1,

as described, is attached to a mileh animal so that one of the animals teats 2-37 is held in the receptacle 36, as shown in Figure 2, and when the admission of fluid to the tubular member 18 from the power source is effected by a suit able valve means. which is not shown since it is common in the art and is not a part of this invention, the piston in the cylinder will be in the initial intake position toward the cylinder head 6. In this position of the pisthe rods hook P enient ot the presses i the 1'05 the IOt heerin s l?) :1 21d 16 n cm the valve o 1 thereby c n motion to the i sou uinner the tent squeezer presses upoi zceptocle 36, thus gradually sque its root by menus ot the hicltened reioW of iueezmg in its ceptaclc, so to prevem mill; in the to tend din i; movement r .ining the to: inclined position, until tlu. .L 41 on reaches the upward exteiuliu oorwon' ot the guides From thi I squeezcr, with the her for its pivot n prevented from at huc 'u'nrd n'lovcinen edges the uttensions 3i and the portions of the guides 3 and the lower the teat squeezer following the curved portions of the guides will swing so as to press upon the teat receptacle until the eat squeczer assumes its terminal s leeting position, as shown in Figure During the squeezing movement, which is accomplished gently and without undue haste so not to hurt the inilch animal, the roclzcr urm gradually released from. its eng incnt with the cum all, and he em in its stead comes into engagement with the upper hlocl: 51 in the rocker arm. Soon afterward hlocl: reaches the terminal portion 4:8 on com, and the rocker fin it the some time comes into engagement with the hook por tion 58 on the piston rod, so that, While the rocker arm is lifted out of engagement with the free end of the spring 70, it else by its in tut xvi 7 the hoolr portion caused to iiclc (her the spring: to 2:, position. in

the the which the free end of the spring 68 is ado oo the reduced portion (39 on the block to chain, M

m ,m i 1: '04 n 111' luloixtjl zl llil lo l !k l ll: (1 BOX-l 1'01 being h( 1 Y ll Whf the spring (ill is co end, tl spring (ll. and

it It Lil JLL has :i. cousiterehly greater power new the springs (31 and 65 combined and there ore overcomes their resistance in its turn the piston again to move to initial intake position, thus expelling; one imprisoned fluid through th outlet valve and returning the tent squeezer to non-squeezing position. lhe operation may then l. e repeated until a sufiicient quantity oi mill; has been drawn from t e tlot is cvic.

l iold tent therein to mg m heretroni, ll '7 edzip "co. to he ettzi lied to u milch animal; a pli ,e uncle secured to the frame and t e teat therein; a cylinder .1 end provided with an t i one end of the cylinder,

p p d. o h connected With a ti Md I101 source: valves, respectively, for 90 the inlet end the outlet; :1 reciprocotiitig piston in the cylinder; upper and lower guides i: a piston rod pivotollv connected 1 th the piston; o. tout squeezer r 9) i iocted with the piston red at the 1. he rot and at its top secured to the i the recepncle and being slidohly and telly connected with the upper guides e its hottom slidehly connected with the lower guides, the squeezers pivotal connection with the piston rod being such as to incli ie the squeezer with its top toward the receptacle and thereby initially squeezing the tent adjacent to the root thereof and succes ively squeezing the tent to its end so as to draw 2. uent-itv of mill: from the tent and at the 11116 time prevent heck-flow of mil lt therein 5 means for closing the inlet valve and opening the outlet valve at a predetermined position oi the piston; and means for automatically returning the piston to the initial. intake position and therew th also the squcezer to e nonequeezing position.

2. A milking machine comprising a frame all connected at one end vviti 3. test squeeze pivotally connected \v' piston rod at the other d thcreor our. top secured to the top of the rec-epto being slidehly and PlVOttcllT connecte the upper guides and. (i l its: bottom connected with the lower guides, the squeezers pivotal connection with the piston rod being such as to incline the squeezer with its top toward the receptacle and thereby initially squeezing the teat to its end so as to draw a quantity of milk from the teat and at the same timeprevent back-flow of milk therein; spring means tor urging the squeezer to the inclined position; means for closing the inlet valve and opening the outlet valve at a predetermined position of the piston; and means for auton'nit-ically returning the piston to the intial intake position and therewith also the squeezer to a non-squeezing po sition.

3. A milking machine comprising a frame adapted to be attached to a milch animal; a pliable receptacle secured to the frame and adapted to receive a teat therein; a cylinder secured to the frame and provided with an inlet and an outlet at one end of the cylinder, the inlet being adapted to be connected with a fluid power-source; valves, respectively. for the inlet and the outlet, the valves being oppositely disposed and slidably movable in unison, so that, when one valve seated, the other valve is open; a reciprocating piston in the cylinder; a piston rod pivotally con nected at one end with the piston; a teat squeezer pivotally connected with the piston rod at the other end thereof and adapted to be moved by the piston for squeezing the teat so as to draw a quantity of mill: therefrom; a slidably and pivotally mounted rocker arm adapted to engage the piston rod; means con nected with the rocker arm and with the valves for moving the valves to or from their respective seats; spring means for actuating the valve-moving means; stop means engaging the rocker arm so as to prevent the valvemoving means from being actuated before the piston reaches its terminal positions; cams on the piston rod for engaging the rocker arm and moving is so as to allow the spring means to actuate the valve-moving means when the piston is in its terminal positions; and spring means for automatically returning the piston to the initial intake position and therewith also the squeezer to anon-squeezing position.

4. A milking machine comprising a frame adapted to be attached to a milch animal; a pliable receptacle secured to the frame and adapted to receive a teat therein; a eylinder secured to the frame and provided with an inlet and an outlet at one end of the cylinder, the inlet being adapted to be connected with a fluid power-source; valves, respectively, tor the inlet and the outlet, the valves being oppositely disposed and slidably movable in unison, so that, when one valve is seated, the other valve is open; a reciprocating piston in the cylinder; a piston rod pivotally connected at one end with the piston; a teat squeczer pivotally connected with the piston red at the other end thereof and adapted to be moved by the piston tor squeezing the teat so as to draw a quantity of milk therefrom; a slidably and pivotally mounted rocker arm adapted to engage the piston rod; means connected with the rocker arm and with the valves for moving the valves to or from their respective seats; spring means for actuating the valve-moving means; stop means engagingthe rocker arm so as to prevent the valve-moving means from being actuated before the piston reaches its terminal positions; cams on the piston rod tor engaging the rocker arm and moving it so as to allow the spring means to actuate the valve-moving means when the piston is in its terminal positions; hook portions on the piston rod for engaging the rocker arm at its extreme cam-engaged positions and co-operating with the spring means in actuating the valvc-moving means when the piston is in its terminal positions; and spring means for automatically returning the piston to the initial intake position and therewith also the squeezer to a nonsqueezing position.

5. A milking machine comprising a collapsible member, means for collapsing said member, and then for permitting said member to regain its normal position, said means including a piston, a cylinder for receiving said piston, said cylinder having an inlet and an outlet port, a piston rod and connections between said piston rod and said ports, for controlling the movements of said piston, said connections including an arm swingable into two positions by the movement of said piston rod, and means for locking said arm in its two positions, said arm being released from locked position by the movement of said pistion rod when said piston has moved a predetermined distance.

EDWARD A. ENGLUND 

